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@ -1,12 +1,72 @@
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Polystrap is a tool to create a foreign architecture rootfs without
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needing superuser privileges by using multistrap, fakeroot, fakechroot
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and qemu user mode emulation from the qemu-user-static package.
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The proper qemu-*-static binary must be properly configured
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(eg. /etc/qemu-binfmt/arm pointing to /usr/arm-linux-gnueabi/ with
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xapt-installed libc and possibly other packages); package
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binfmt-support (which is only a "Recommends" of qemu-user-static) must
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also be installed.
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Polystrap is a tool to create a foreign architecture rootfs without needing
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superuser privileges by using multistrap, fakeroot, fakechroot and qemu user
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mode emulation from the qemu-user package.
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QEMU USER MODE
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==============
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To make qemu user mode emulation work you need to install the packages
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qemu-user and binfmt-support. Until bug #632192 is fixed you will have to
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provide properly filled /etc/qemu-binfmt/$arch/ directories. $arch is a qemu
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arch (eg: arm for arm, armel and armhf). "properly filled" means, that you have
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to provide a root directory tree in that directory that fits the architecture
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you want to bootstrap debian for. There are a couple of ways to achieve that:
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1. manually download and `dpkg -x` the required packages into
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/etc/qemu-binfmt/$arch/
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2. copy over a just extracted multistrap run for your target system into
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/etc/qemu-binfmt/$arch/
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3. run the following multistrap.conf, configured for your target system to
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create a root directory tree that you copy into /etc/qemu-binfmt/$arch/
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-%<----------------------------
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[General]
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arch=
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directory=
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cleanup=true
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unpack=true
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noauth=true
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aptsources=Debian
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bootstrap=Debian
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allowrecommends=false
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addimportant=false
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omitrequired=true
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[Debian]
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packages=libc6 libselinux1 libacl1 man-db libstdc++6 libfreetype6 libx11-6 libfontconfig1
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source=http://cdn.debian.net/debian
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suite=sid
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omitdebsrc=true
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-%<----------------------------
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You can also avoid all this trouble by either waiting for #632192 to be fixed
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or by applying the patch from there to qemu and using the newly introduced
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environment variable QEMU_LD_PREFIX like so:
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QEMU_LD_PREFIX=/tmp/debian-sid/ ./polystrap.sh -d /tmp/debian-sid/ om-gta02
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FAKEROOT/FAKECHROOT
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===================
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Additionally you will need to have copies of libfakechroot.so and
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libfakeroot-sysv.so for your target architecture in /usr/lib/<arch-triplet>/.
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Get the debian packages of fakeroot and fakechroot for your target architecture
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and copy the shared libraries into /usr/lib/<arch-triplet>/. For example for
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arm do:
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wget http://ftp.debian.org/debian/pool/main/f/fakechroot/fakechroot_2.14-1_armel.deb
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wget http://ftp.debian.org/debian/pool/main/f/fakeroot/fakeroot_1.14.5-1_armel.deb
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sudo mkdir -p /usr/lib/arm-linux-gnueabi/
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dpkg-deb --fsys-tarfile fakeroot_1.14.5-1_armel.deb | sudo tar -xf - --strip-components=4 -C /usr/lib/arm-linux-gnueabi/ ./usr/lib/libfakeroot/libfakeroot-sysv.so
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dpkg-deb --fsys-tarfile fakechroot_2.14-1_armel.deb | sudo tar -xf - --strip-components=4 -C /usr/lib/arm-linux-gnueabi/ ./usr/lib/fakechroot/libfakechroot.so
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INNER WORKINGS
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==============
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While I wanted to build without superuser privileges, multistrap would never
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offer mechanisms that would allow me to do so. Hence I wrote this script which
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josch
13 years ago